Displaying 1 - 50 out of 310 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Solidago drummondii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | type | 259747 |
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| Vesicaria nuttallii Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | — | Praries of Red River | isolectotype | 185839 |
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| Berlandiera tomentosa Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | possible type | 162513 |
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| Solidago nitida Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | syntype | 259920 |
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| Rhynchosia torreyi Vail | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Sand hills | holotype | 26923 |
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| Halea ludoviciana Torr. & A.Gray | M. C. Leavenworth s.n. | 06 Jun 1837 | United States of America | Louisiana | Western Louisiana | syntype | 178891 |
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| Grossularia texensis Coville & A.Berger | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Near St. Augustine | isotype | 185886 |
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| Chrysopsis lanuginosa Small | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | — | 30968 |
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| Berlandiera subacaulis var. ß Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | possible type | 162509 |
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| Mimosa strigillosa Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Arkansas | lectotype | 2501 |
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| Mimosa strigillosa Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | syntype | 2502 |
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| Helianthella grandiflora Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | type | 179046 |
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| Baptisia sphaerocarpa Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Vicinity of Fort Towson. | — | 6170 |
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| Solidago amplexicaulis Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | type | 259629 |
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| Solidago amplexicaulis Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | type | 259630 |
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| Chrysopsis scabrella Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | holotype | 163170 |
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| Melothria grandifolia Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | — | Bottom of the Mississippi | possible type | 172478 |
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| Solidago speciosa var. rigidiuscula Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | syntype | 259962 |
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| Chaetanthera asteroides Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Arkansas | — | 163309 | ||
| Carex flaccosperma Dewey | M. C. Leavenworth s.n. | 1845 | United States of America | — | Camp Sabine | probable isotype | 39366 |
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| Eupatorium parviflorum var. lancifolium Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | probable type | 168779 |
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| Vicia ludoviciana Nutt. ex Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Texas | Nacogdoches Co. "Near Nagadoches" | lectotype | 50651 |
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| Phacelia glabra Nutt. | M. C. Leavenworth s.n. | s.d. | United States of America | — | Louisiana & Georgia | — | 83930 |
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| Chapmannia floridana Torr. & A.Gray | M. C. Leavenworth s.n. | May 1836 | United States of America | Florida | Ft. King | type | 6401 |
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| Asclepias feayi Chapm. ex A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | type | 4648 |
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| Polygala grandiflora var. angustifolia Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | lectotype | 406785 |
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| Vitis incisa Nutt. | M. C. Leavenworth s.n. | — | — | — | syntype | 415159 |
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| Penstemon tubiflorus Nutt. var. tubiflorus | M. C. Leavenworth s.n. | May and June | United States of America | — | Vicinity Fort Towson | — | 663249 |
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| Rudbeckia alismifolia Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | "Louisiana & Texas" | syntype | 232822 |
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| Lepidanthus obovatus Nutt. | M. C. Leavenworth | May | United States of America | — | Arkasas Territory: Fort Towson | isotype | 263531 |
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| Sophora tomentosa var. truncata Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | lectotype | 26995 |
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| Sophora tomentosa var. truncata Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Tampa Bay | isotype | 26996 |
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| Carex leavenworthii Dewey | M. C. Leavenworth s.n. | 1845 | United States of America | Louisiana | holotype | 380956 | |||
| Solidago x dispersa Small | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | probable holotype | 259745 |
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| Leptopoda brachypoda var. ß Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | lectotype | 180535 |
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| Coreopsis leavenworthii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Near Fort Drane, eastern Florida | syntype | 167697 |
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| Coreopsis leavenworthii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | Eastern Florida | possible syntype | 167698 |
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| Chrysopsis gigantea Small | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | holotype | 163248 |
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| Chrysopsis gigantea Small | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | holotype | 163251 |
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| Solidago leavenworthii Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | type | 259888 |
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| Vincetoxicum floridanum Vail | M. C. Leavenworth | — | United States of America | Florida | East Florida | lectotype | 318829 |
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| Draba cuneifolia Nutt. | M. C. Leavenworth s.n. | — | United States of America | Oklahoma | Choctaw Co. | isosyntype | 185278 |
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| Aster dumosus var. subulifolius Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | probable syntype | 158807 |
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| Euthamia leptocephala (Torr. & A.Gray) Greene | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | not a type | 259891 |
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| Solidago leptocephala Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | type | 259892 |
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| Dodecatheon meadia var. brachycarpum (Small) Fassett | M. C. Leavenworth s.n. | s.d. | United States of America | — | Red River prairies | — | 329425 |
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| Aster phyllolepis Torr. & A.Gray | M. C. Leavenworth IIs.n. | s.d. | United States of America | — | Arkansas ? [Protologue mentioned western… | syntype | 161981 |
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| Vesicaria grandiflora var. pallida Torr. & A.Gray | M. C. Leavenworth s.n. | — | United States of America | Texas | Near St. Augustine | holotype | 185835 |
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| Sophora affinis Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Louisiana | Red River | lectotype | 26983 |
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| Leptopoda fimbriata Torr. & A.Gray | M. C. Leavenworth s.n. | s.d. | United States of America | Florida | E. Florida | — | 180539 |
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